The referendum is done. The punishments are optional. Furthermore, any punishment on the UK is punishment on the EU itself. The EU will more likely to suffer more by such punishment than by the UK. Who would be to blame for it, Brexit or the EU? And who is to blame for the EU's own fragility? Would it be that smart or childish? Which side of the punishment issue would UK Bremainers weigh in on?

So run another referendum or a general election on the Brexit issue, as already suggested by Labour. Then you'll get a definitive result. that's the only way to ensure a democratic outcome from this mess.